Furnace-grate.



No. 878,246. PATENTED PEB. 4, 1908. H.' SIEBN & L. DANHOPP. FURNAGE GRATB APPLICATION FILED AUG. 12. 1903.

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No. 878,246. PATENTED FEB. 4, 1908. H. SIEBEN & L. DANHOFF.

FURNACB GRATE.

APPLICATION FILED 1113612.71903. 3 SHEETSusHBET 3' jaen/rs 'JMQWW' #QZ @uw 3 V ma AThe invention consists substantially in the 'chamber an HENRY SIEBEN AND LAWRENCE DANHOFF, OF CHICAGO; ILLINOIS.

FlURNACE-GRATE.

Nol is'zaaee.

Specification of Letters|Patent. Application nea angustia 1903. serial No. 169.236.

Patented Feb. 4, 1908.

lTQ allv whom it may concern:

l Be it known that we, HENRY SIEBEN and LAWRENCE, .DANHoFF, citizens of the United States, residing at Chicago, in the county of yCookand State of Illinois, have invented a new and useful F urnace-Grate, o f which the following is a specification.

'4 This invention relates to furnaces.

- lThe object' of the invention is to provide a furnace which is simple in construction and eflicient in action and economical of manufacture. y .l

, A furthervobject of the invention is to provide a construction of automatic stoker for furnaces' which feeds smoothly -and evenly With all grades of lfuel, and in which the pmountand manner of such feed can be reguated.

n A further object of the invention is to rovide an improved construction of trave ing lgrate for furnaces. v

Other objects of the invention will appear more fully hereinafter. 1

construction, combination, location and arrangementof parts, all as will be morefully hereinafter set forth, as shown in the accompanying drawings, and finally 'pointed out in the appended claims. Y

yReferring to the accompanying drawings, and tothe various views and reference signs appearin thereon,'Figure 1 is a view in vertical on itudinal section of a -furnace showing the grate and other features` .embodying the principles of our -invention. Fig.,2 is a transverse section of the same taken onthe line 2, 2, of Fi 1, looking in the direction of the arrows., ig. Slis a detail lsectional View taken on the line 3, .3, of Fig. 1. Fig. 4 is a detail view in side eelevation showing means for operating the parts broken off and front grate operatings rocket shaft. Fig. 5 is` an envlarged detai sectional view of a portion of view of a single grate bar.

ythe Agrate bars and sprocket mechanism Fig. 6 is a detail top plan Fig. 7 is a detail the individual grate elements'. Fig. 8 is a view in side elevation of the grate bar shown in Fig. 6. i

The same part is designated by the same reference sign wherever it occurs throughout the several views.

In the operation of furnaces great difficulty has always been experienced in the shown in Fig. 1

proper feeding and spreading of the fuel upon moving grates and also by the fine fuel, as well as ashes, dropping through between the bars, thereby uncovering the grate, especially at the inner end thereof, whereu on an excess of air passes into the fire box, tiereby interfering with the combustion of the fuel and with the heat and injuring the fire. `It is desirable, therefore, to construct the fuel feeder in such a way that fuel of any sort may be fed uniformly, and provide a construction of traveling grate which shall give a proper supply of air at every point on its surface, an at the same time adequately support the finest fuel and prevent the same from falling between the grate bars. It is further desirable to construct the grate in such a way that its individual elements can be 'renewed when worn without the necessit of renewing the entire grate bar.

eferring to the accompanying drawin s, reference sign A designates the shell or boi er ipoper, supported in a. suitable setting B of e brick `or other material.

C designates the fire box or furnace chamber, and D the ash it located below the grate, and into which t e cinders and ashes are carried or deposited.

E designates a hopper suitably located at the front 4of the boiler, and having an open bottom orrnouth portion .F delivering into the fire box. The bottom Gr of the hopper is shown in the form of a shell or plate just above the usual fire door' H.

I designates a plunger or push-bar. Any suitable means may be provided for operating said plunger or bar. We have shown a simple construction as illustrative of an operative arrangement, wherein the o lunger or bar is. connected -to a bell crani lever K pivoted upon the side of the hopper at L.

M designates alink adjustably connected to the arm 7c of the bell crank lever, as, for instance, 'bv means of an adjusting screw N operating t rough a slot in said arm 7c. AThe ylink M is shown connected to an operating eccentric O arranged to rotate continuously by any suitable means (not shown).

In order .to regulate and control the delivery of fuel from the hopper into the furnacechamber or fire box, when the stoker above referred to is in operation, and to prevent `the fuel from dropping through the hopper into the furnace chamber or re box when such fuel is first supplied to the hop er, we arrange a plate P in the hopper, an yin position to extend over the delivery mouth of the hopper atthe point Where such mouth l ber.

delivers into the furnace chamber or lire box, and We provide means for regulating or varying the inclination of such plate in the hopper, thereby regulating and controlling the delivery of the fuel into the furnace cham- These results may be accomplished in any suitable manner. We have shown a simple construction for accomplishing the desired objects, wherein plate P is pivoted or otherwise adjustably mounted above the mouth of the hopper upon trunnions Q lextending through the side Walls of the hopper, and an adjusting handle or bar secured to one of said trunnions affords means by Which the inclination of the plate P may be varied. The arm R may ibe locked in any suitable or` convenient position, in any convenient manner, as, for instance, by means of the clamp-screw T cooperating With a locking segment S.

A denotes generally the traveling grate. This is composed of bars B extending transversely of the furnace chamber, and upon which are.mounted the grate elements designated generally in Figs. 1, 2 and 8 by reference si n P. These grate elements may be arrange and removably supported upon the bars B in any suitable or convenient manner by which said elements are held in position thereon. In the lparticular -form shown, to which, however, our invention is not to .be limited or restricted, the grate element supporting bar B is polygonal in cross'- section. The grate elements P are each provided With a hub portion p arranged to be slipped onto the polygonal-shaped bars, a sufficient number of said elements being slipped onto each bar to occupy practically the entire transverse Width of the space in which. the traveling grate operates. Each element is provided' With a segmental portion P2, the surface Yof, which constitutes the grate, or fuel or fire supportingsurface of the grate. The hubs p should be of such thicke ness as to aiiord a slight osetrfrom each other laterally of the segmental portions of the elements, thus affording passages for the air supplied to the furnace chamber thmugh the ash pit to the fuel. In order to facilitate the supply of air to the bed of fuel from the ash pit through the space between ladjacent grate elements, We prefer to groove or corrugate the sides or faces of the grate elements, as clearly indicated at P3, thus affording grooved or channeled passages for the air in its passage from the ash pit through the grate to the fuel. We have found that the air is efficiently distributed to the fuel When passing through corrugated or fluted passages through the grate elements, and this advantage We secure in thesimple manner above described.

Reference signs C C designate s rocket chains, having sprocket links C2, an intermediate driving links C3.v The driving links of each sprocket chain are provided with openings therethrough shaped to conform to the transverse sectional shape of the grate bars, whereby such links may be slipped over the ends of such bars to afford means for connecting the sprocket chains to such bars. In practice, We propose to employ a sprocket chain or belt connection such as above described, each end of each set of grate bars composing a traveling grate. These sprocket chains operate over' sprocket Wheels F. The sprocket Wheels 3 F are'respectively mounted upon shafts G H suitably journaled in boxes at the iront and rear of the furnace chamber, the sprocket Wheels F being mounted to revolve loosely upon the shaft H', While the sprocket Wheels E .are keyed or otherwise fixed to rotate with their supportingP shaft G. Rotary motion may be imparted to shaft G, Which lconstitutes the driving/shaft for the grate., in any convenient manner. A simple arra .ement is shown, Whe 'ein a ratchet'wheel J is mounted upon to rotate with shaft G', and an arm or lever K is pivotally mounted upon said shaft and carries a spring-pressed paWl arranged to cooperate With the ratchet teeth ofvdisk A rod L suitably actuated by an eccentric, or in any other manner, is adjustably connected to the arm or lever K so vthat u on each actuation of said rod L one step o rotary movement is imparted to shaft G, thereby imparting a step of movement to the traveling grate.v vvWhile We have described only one grate, it is obvious that only one or as many of such grates as may be necessary or desired may be employed in each furnace.

In order to suitably sup )ort and guide vthe grate elements during that portion of the travel thereof in which said elements o erate as a supporting surface for the bed o fuel, We provide longitudinally extending tracks or rails ML, arranged adjacent and transversely with respect to the ends of the grate bars B. 4A grate element provided With a special segmental portion, indicated by reference sign P4, is arranged adjacent to each of the grate bars, and larger than the segmental portions of the other elements arranged 0n the same bar therewith, in order to afford strength and rigidity, and upon the hub P of such element (see Fig. 7) We mount friction rollers N in any convenient manner,

as, for instance, upon studs 0', said rollers` being received and resting upon and guided by the bars M. In this manner the grate bars are supported adjacent to each end thereof upon the tracks or rails AM during that portion of the travel When the fuel orthe travel of the grate, we provide means u on which the grate elements, or certain of) them, are supported during the return 'movementcf such grate. To thisend, we employ bars Q arranged in pairs, ,and the members ofeach pair'suitably spaced apart to receive a series of guide or supporting rollers R therebetween, and we arrange such bars or rails to extend longitudinally to the furnace chamber and underneath the traveling grate, and in position with reference to the special segmental portions P4 for the said segmental portions P* to be received and to rest or to be supported upon said rollers R', as clearly indicated in the drawings (see Figs. 1, 2 and 5). r

From the foregoing description it will be observed lthat we provide an exceedingly sim le arrangement of traveling grate,where in t e fuel wzhen deposited upon the grate is carried inwardly through the furnace chamber, and the process of combustion progresses as the fuel is thus carried along, the shape of the grate elements promoting combustion by effectiny a breaking up of the incoming air intoindaividual jets by reason of the corrugated shape ofthe side surfaces or faces of the segmental ortions thereof as above explained. It wi l also be seen that we provide efficient means forsupporting the traveling j grate, both in advancing movement of a portion thereof into thef furnace cahmber, and

also during the return mvement of the other portion thereof, and with the least degree of friction and by pyacing the supporting bars or rails some distance from the grate bars, asl

above ex lained, the ashes and cinders are prevente from obstructing the lmovements of the grate bars. It will also be seen that we provide a' construction in which renewals or repairs may be readily made, and wherein individual grate elements,l when broken, or injured, or burned off, may be readily renewed, without the expense of renewing an entire grate bar. 'It will also be seen that with the construction above described a furnace grate may be placed within a space of shallowdepth, which is an important advantage in many instances where the available space for the fire box is limited; and, moreover, the shallow depth of the fire box permitted by our invention is advantageous in inspection, repair, renewal of parts, or the' like, and to this end, said frame A2 may operate upon rollers B2 operating on tracks C2 arranged to extend into the furnace chamber.

Itv will be observed that the segmental portions of the grate elements, when in the position to form asupport for the bed of fuel,

are spaced in such close relation with respect to each other as to' afford insuflicient room therebetween for fine particles of the coal or fuel to drop down into the space between adjacent elements, while at the same time permitting a supplyr of air to the bed of fuel be.

bustion of the fuel and the maximum amount of steam production obtainable from a given quantity of coal, and without loss or waste of fue In practice there is a tendency to` cause slag or other particles of fuel in a highly heated condition, when coming in contact with the iire wall at the rear of the furnace, to adhere or stick thereto, therebyv cloggin u the space or opening at the de ivery en oi' the grate. In order to overcome this result we employ a pipe D2, of comparatively large cross-sectional area, and arrange the same to extend transversely across the furnace chamber adjacent to the rear of the iire wall thereof and at a point over the delivery endof the traveling grate, said pipe forming in effect a chamber, and being supportedin any suitable or convenient manner in the brick or masonry work composing theiiire wall, and we maintain this enlarged pipe or chamber full of water. A convenient arrangement is shown wherein a supply pipe E2 delivers at one end into the enlarged pipe or chamber, and an exhaust pipe F2 communicates with the other end of said enlarged pipe or chamber.

As above indicated, the enlarged pipe or chamber D2 may be supported in any suitable or convenient manner. We have shown a sim le arrangement wherein we employ rods 2 suitably anchored in the masonr composing the fire walll and tapped througli the inner side of the pipe or chamber D2, and at their outer ends bearing against the inner wall of said pipe or chamber.

It is believed that the operation of the construction above described will be readily understood from the foregoing description taken in connection with the accompanying drawings, and many variations and changes in the details of construction and arrangement would readily occur to persons skilledV in the art and still fall within the spirit and scope of our invention. We do not desire, therefore, to be limited or restricted to. the exact'details of construction and arrangement shown and described. But

Having now set forth the object and nature of our invention', and a construction embodying the principles thereof, Vwhat we f claim as new and useful and of our own invention,4f and desire to secure by Letters Patent, is:

1. In a boiler fprnace, a grate comprising grate bars, independent' grate elements strung upon each of said bars, each grate element including a hub portion and a segmental portion, the hub portions being grate bars, removable grate elements each having a hub portion and a segmental portion, the hub portions adapted to be strung upon the grate bars and the segmental portions forming a support for the fuel bed,one of said grate elements near eachend of each grate bar having yanv enlarged segmental portion, and guide vrails arranged in the path of movement of the grate elements having the enlarged segmental portions, to form a supporting guide therefor and to support the corresponding bars of the grate, 'a sprocket chain connecting said grate bars,

v and means for actuating said chain.

3. In a boiler furnace, a grate comprising l gratebars, grate elements removably mountvand a segmental portion, one of sai eve 24e ed thereon, each including a hub portion grate elements near each end of each grate bar having an enlarged segmental portion, and rollers mounted upon the hub portion thereof, guide rails upon which said rollers are supported and guided during one portion of the travel of said grate bars, guiding rails for supporting and guiding the enlarged segmental portions of said elements'during another portion of the travel of the grate bars, said segmental portions and guiding rails forming a support for the corresponding grate bars, sprocket chains connecting said gratebars, and means for actuating said chains.

4. In a boiler furnace, a movablegrate comprising grate bars polygonal sha ed incross section, grate elements each aving a hub portion and a segmental portion, the hub portions having openings therethrough corresponding in shape to the cross sectional shape of the grate bars and adapted to be strung upon the grate bars, each grate bar carrying a series of said elements, driving links strung upon the ends of the. grate bars, connecting links for the driving links at adjacent ends of the grate bars, thereby form ing actuating. chains for the grate bars, and means for actuating said chains.

In witness whereof, we have hereunto setl our hands this 1st day of August, 1903, in 'the presence of the subscribing witnesses.

HENRY SIEBEN. LAWRENCE DANHOFE Witnesses:

E.I C. SEMPLE, S. E. DARBY. 

